Berberis piperiana can attain a height of up to 80 cm (30 inches). Leaves are evergreen, pinnately compound with 5-9 leaflets. Berries are dark blue and waxy. The species is related to the more common Oregon-grape, B. aquifolium, but distinguished by its shorter stature and broader leaflets.
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- Loconte, H., & J. R. Estes. 1989. Phylogenetic systematics of Berberidaceae and Ranunculales (Magnoliidae). Systematic Botany 14:565-579.
- Marroquín, Jorge S., & Joseph E. Laferrière. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Journal of the Arizona-Nevada Academy of Science 30(1):53-55.
- Laferrière, Joseph E. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Bot. Zhurn. 82(9):96-99.
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